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Hot melt adhesive composition

a technology of hot melt adhesive and composition, which is applied in the direction of adhesives, etc., can solve the problems of insufficient adhesion of ethylene vinyl acetate copolymer based hot melt construction adhesive in spray application, adhesive build-up on the machine, and insufficient adhesion of hot melt construction adhesive. achieve good cohesive strength

Inactive Publication Date: 2006-06-22
H B FULLER LICENSING & FINANCING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a hot melt adhesive composition that exhibits excellent compatibility, low viscosity, high heat stability, good adhesion, and cohesive strength. The composition includes ethylene-vinyl acetate copolymer, styrene-ethylene-butadiene-styrene block copolymer, and a tackifying resin. The composition has a melt viscosity of no greater than 7,000 cps at 135°C and no greater than 10,000 cps at 177°C. The composition can be used in bookbinding applications and remains clear or transparent after aging at the application temperatures.

Problems solved by technology

Depending on the function of components the hot melt adhesives used for bonding one component of the article may be completely unsuitable for bonding another component of the article.
While providing the desirable heat stability and flexibility to the bonded substrates, ethylene vinyl acetate copolymer based hot melt construction adhesives exhibit insufficient adhesion in spray applications.
They also tend to build viscosity slowly as they cool causing application problems.
Namely bleeding or soaking through the nonwoven substrate and causing adhesive build up on the machines.
However formulations that have low enough viscosities to be applied at low application temperatures such as no greater than about 135° C. tend to contain a high amount of liquid plasticizer causing these adhesives to be cohesively weak and have a tendency to continue to flow at room temperature or slightly above room temperature.
This can cause disposable articles to stick together under storage or shipping conditions.
Therefore, the two different copolymers have been considered as incompatible.
Without the desirable compatibility, it has been a challenge in the art to formulate a hot melt adhesive including both ethylene vinyl acetate copolymer and styrenic block copolymer that is not only compatible but also has well balanced properties such as desirable heat stability, low viscosity suitable for applications at low temperatures, high adhesion and cohesive strength, as well as no bleed through.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

Test Procedures

[0056] Test procedures used in the examples include the following.

Compatibility

[0057] Compatibility is determined by visual inspection as follows:

[0058] The adhesive sample is molten at 135° C., or 177° C. The molten adhesive is then visually inspected. A compatible adhesive should look clear and transparent, free from clouds, haze; homogeneous and smooth, free from lumps or gels and separation layers. The adhesive is then kept in a forced air oven for 96 hours and visually inspected again thereafter. A compatible adhesive should appear substantially the same as the initial unaged adhesive.

[0059] The result of the inspection is designated as “O” if the adhesive is clear and smooth (good compatibility), as “⊖” if the adhesive has slight cloudiness but smooth (acceptable compatibility), and as X if the adhesive has cloudiness and grainy or even lumpy (incompatible).

Melt Viscosity

[0060] A hot melt adhesive is molten by heating and the viscosity at a test temper...

experimental examples 1-12

[0069] Various styrenic block copolymers (SBC) and ethylene vinyl acetate copolymers (EVA) are blended together at about 350° F. at EVA / SBC weight ratio of 1.75:1 according to Table I. The initial compatibility of each of the blends is visually inspected and the results are reported in Table I. Each blend is aged at 135° C. for 96 hours and the final compatibility is again visually inspected. The results are also reported in Table I.

examples 1-14

[0070] Hot melt adhesive compositions of each of Examples 1-14 are prepared by combining and melting the ingredients in the amounts (% by weight) specified in Table II at 350° F. Various properties of the adhesive compositions of Examples 1-14 are then tested according to the test methods described above. The results of the tests are also reported in Table II.

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Abstract

A hot melt adhesive composition includes ethylene vinyl acetate copolymer(s) having average vinyl acetate content of from about 10% to about 30%, styrene-ethylene-butylene-styrene block copolymer, tackifying resin, and optionally, a plasticizer or a wax.

Description

[0001] The invention relates to a hot melt adhesive composition including ethylene vinyl acetate copolymer(s), styrene-ethylene-butylene-styrene block copolymer, tackifying resin, and optionally plasticizer(s) and / or wax. [0002] Hot melt adhesives have been used for the construction of disposable articles such as disposable diapers, sanitary napkins, surgical drapes, hospital pads, and adult incontinent products, etc. Disposable articles are typically composed of several components that are bonded together by various hot melt adhesives. Depending on the function of components the hot melt adhesives used for bonding one component of the article may be completely unsuitable for bonding another component of the article. [0003] One particular component of the disposable article includes a polyolefin film e.g., a polyethylene or polypropylene film, bonded to a tissue or nonwoven substrate through a hot melt construction adhesive to form a leakage-prevention sheet to prevent permeation of...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L53/00
CPCC08L23/0853C08L53/02C08L2205/02C08L2205/03C09J123/0853C09J153/02C09J153/025C08L2666/24C08L2666/02C08L53/00C08L2666/04
Inventor VAUGHAN, STEVEN R.BRISENO, CARLOSRESKI, MERILEE M.
Owner H B FULLER LICENSING & FINANCING INC
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